only in patch2:
unchanged:
--- a/core/modules/views/tests/src/Unit/Plugin/views/query/PostgresqlDateSqlTest.php
+++ b/core/modules/views/tests/src/Unit/Plugin/views/query/PostgresqlDateSqlTest.php
@@ -55,7 +55,7 @@ public function testGetDateField() {
   public function testGetDateFormat($field, $format, $expected_format) {
     $date_sql = new PostgresqlDateSql($this->database);

-    $this->assertEquals("TO_CHAR($field, '$expected_format')", $date_sql->getDateFormat($field, $format));
+    $this->assertEquals("TO_CHAR(TO_TIMESTAMP($field), '$expected_format')", $date_sql->getDateFormat($field, $format));
   }

   /**